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EIN Number: What It Is and How to Apply for Free

EIN Number illustration

An EIN is a 9-digit federal tax ID the IRS gives businesses. Applying is free directly at IRS.gov. Never pay a site that only "files your EIN".

Who needs an EIN?

How to apply for an EIN

  1. Online (US SSN/ITIN holders): IRS online application, EIN issued immediately.
  2. Fax: send Form SS-4 to the IRS.
  3. Mail: send Form SS-4; slowest option.
  4. Phone (international applicants only): the IRS international line.

EIN for non-US residents

Without an SSN or ITIN you cannot use the online form. You file Form SS-4 by fax or mail, or apply by phone. We're documenting this process first-hand; see our about page.

FAQ

Is an EIN free?

Yes. The IRS never charges for an EIN.

How long does it take to get an EIN?

Online applications get a number immediately. Fax and mail take longer; check IRS.gov for current processing times.

Is an EIN the same as a tax ID number?

An EIN is a type of federal taxpayer identification number used for businesses.

Last updated 2026-10-11. Not legal or tax advice.